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Dorsal fin of a shark. A dorsal fin is a fin located on the back of most marine and freshwater vertebrates within various taxa of the animal kingdom.Many species of animals possessing dorsal fins are not particularly closely related to each other, though through convergent evolution they have independently evolved external superficial fish-like body plans adapted to their marine environments ...
Dorsal fins: Located on the back of the fish, dorsal fins serve to prevent the fish from rolling and assist in sudden turns and stops. Most fishes have one dorsal fin, but some fishes have two or three. In anglerfish, the anterior of the dorsal fin is modified into an illicium and esca, a biological equivalent to a fishing rod and lure.
The adipose fin is a soft, fleshy fin found on the back behind the dorsal fin and just forward of the caudal fin. It is absent in many fish families, but found in nine of the 31 euteleostean orders ( Percopsiformes , Myctophiformes , Aulopiformes , Stomiiformes , Salmoniformes , Osmeriformes , Characiformes , Siluriformes and Argentiniformes ...
The dorsal fin is positioned opposite or behind the origin of the anal fin. Goldeyes also have a fleshy keel that extends from the pectoral fins to the base of the anal fin. [4] Their mouth is large and in the terminal position with a blunt round snout. There are teeth present on the tongue, [6] the roof of the mouth on the parasphenoid bone ...
The dorsal fin has 12–13 spines and 10–11 soft rays while the anal fin contains 3 spines and 8 soft rays, [2] and the anal fin is rounded. [8] The pectoral fins contain 17–19 fin rays and are comparatively short, not extending as far as the level of the anus. The caudal fin is forked, but not extremely so. [7]
The garfish is a long and slender fish with a laterally compressed body, and grows to about 50 to 75 cm (20 to 30 in) in length. The jaws are elongated and armed with sharp teeth. The pectoral, dorsal, and anal fins are situated well back on the body and the latter two are similar in appearance.
A group of friends exploring the waters off La Jolla Cove on Saturday came across a sea creature unlike anything they'd ever seen: a 12-foot-long rare fish from the depths of the ocean.
The caudal fin is homocercal, meaning the upper and lower lobes are about equal in size. The spine ends at the caudal peduncle, the base of the caudal fin, distinguishing this group from those in which the spine extends into the upper lobe of the caudal fin, such as most fish from the Paleozoic (541 to 252 million years ago). The neural arches ...